Collection: Silvertop Stringybark

Silvertop stringybark is a native hardwood species notable for its distinctive bark, with grey fibrous layers extending to the upper limbs, which are smooth and whitish. It is a medium to tall tree, reaching heights of up to 40 metres, and occurs naturally along the coastal fall of the tablelands in northern New South Wales. Renowned for its pale brown heartwood with occasional pinkish hues, silvertop stringybark is valued for its workability and versatility across structural and decorative applications.

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Appearance of Silvertop Stringybark Timber

The heartwood of silvertop stringybark is pale brown with occasional pinkish tones, while the sapwood, up to 50 millimetres wide, is visually indistinct from the heartwood. The timber features a close, straight grain with a medium and even texture, typically free from gum veins, adding to its clean and uniform appearance.

Applications of Silvertop Stringybark Timber

Silvertop stringybark is versatile and used for a range of purposes. It is commonly employed in preservative-treated posts, poles, and sleepers, as well as in building framework, decking, and flooring. Its ability to glue well with phenolics makes it suitable for structural plywood and glue-laminated members. Additionally, the timber readily accepts paint, stains, and polish, enhancing its usability in both structural and decorative projects.

Workability of Silvertop Stringybark Timber

Rated as a moderately hard timber, silvertop stringybark is easier to work than some other hardwoods. It machines well and is amenable to the use of standard fittings and fastenings. Its gluing properties make it a strong candidate for engineered timber applications, including laminated beams and plywood. Its general behavior and properties are comparable to blackbutt.

Durability of Silvertop Stringybark Timber

Silvertop stringybark is classified as a class 3 hardwood, with an above-ground life expectancy of 7 to 15 years and an in-ground life expectancy of 5 to 15 years. Although it is not termite-resistant, its sapwood is immune to lyctid borer (powder post beetle) attack and can be readily impregnated with commercially available preservatives to enhance durability.

Origin and Availability of Silvertop Stringybark Timber

Silvertop stringybark is native to northern New South Wales, where it is relatively common. Timber products derived from this species are widely available in its region of origin, though they may be less common in other parts of Australia.

Source of Silvertop Stringybark Timber

The timber is harvested from native forests, providing a sustainable and versatile material for both structural and decorative applications. Its ease of workability and clean appearance make it a favored choice for a variety of building and design needs.

 Very LowLowMediumHighVery High
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Tangential :    10.0%
Radial :    6.0%
Unit Movement Tangential:     
Unit Movement Radial:     

Very High

High

Reasonably High

Medium High

Medium

Reasonably Low

Low

Very Low

Unseasoned:

S1

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Seasoned:

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 Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5
Unseasoned:F27F17F14F11F8
Seasoned:F34F27F22F17F14

Seasoned:

850kg/m3

Unseasoned:

1050kg/m3

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

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J6

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Seasoned:

JD1

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 White, yellow, pale straw to light brownPink to pink brownLight to dark redBrown, chocolate, mottled or streaky
  
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Modulus of Rupture - Unseasoned:87 MPa
Modulus of Rupture - Seasoned:143 MPa
Modulus of Elasticity - Unseasoned:15 GPa
Modulus of Elasticity - Seasoned:18 GPa
Maximum Crushing Strength - Unseasoned:38 MPa
Maximum Crushing Strength - Seasoned:73 MPa
Impact - Unseasoned:17 J
Impact - Seasoned:18 J
Toughness - Unseasoned: 
Toughness - Seasoned: 
Hardness - Unseasoned:5.5
Hardness - Seasoned:8.8
 LowModerateReasonably HighHigh
 (0 - 5 yrs)(5 - 15 yrs)(15 - 25 yrs)(more than 25 yrs)
In-Ground: Check mark 
 (0 - 7 yrs)(7 - 15 yrs)(15 - 40 yrs)(More than 40 yrs)
Above ground: Check mark 
 (0 - 20 yrs, usually < 5)(21 - 40 yrs)(41 - 64 yrs)(More than 60 yrs)
Marine Borer Resistance:Check mark   
Lyctid Borer Susceptibility:Not Susceptible
Lyctid Borer Susceptibility - Other: 
Termite Resistance:Not Resistant
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EFH Spread-of-Flame Index:        
EFH Smoke-Developed Index:         
1 - non-combustible2 - reasonably non-combustible3 - slightly combustible4 - combustible

Fire Properties Group
Number:

Group Number - Other:

3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications